Skiving machine



8 Sheets-Shet l A.` R. RlnnERsTRoM SKIVING MACHINE Filed May 51, 1922 July 16, 1929- AfR. RlDDERsTRoM 1,721,046

SKIVING MACHINE Filed May 51. 1922 8 Sheets-Sheet 2 July 16, 1929. A. R. RIDDERSTROM 17,721,046Y

sKIvING MACHINE Filed may: 51, 1922 8 sheets-sheet 5 www A. R. RIDDERSTROM 1,721,046

July 16 1929,

SKIVING 'MACHINE 8 Sheets-Sheet Filed May 31, 1922v ffy.

July 16, 11929. A. R. RIDDERsTRoM sKIvING MACHINE Filed May 51: 1922 8 Sheets-Sheety 6 ML. T \\\\i\m......

` Inventor ndmwRl-ldderaf-om ofhy July 16, 1929. A. R. RlDDr-:RsTRoM i 1,721,046

SKIVING MACHINE Filed May 31, 1922 8 Sheets-Sheet 8 ZJ 660 ae q694 fa f 74 Int/autor dndfww R Ridder-strom Patented July 16, 1929.

UNITED STATES ANDREW R. RIDDERSTBOM, OF NAHANT, MASSACHSETTS,iASSIGrNOR, BY MESNE ASSIGNMENTS, TO UNITED SHOE MACHEERY CORPORATION, JERSEY, A CORPORATION OF NEW OF PATERSON, NEW

sKivmG MACHINE.

- Application led May 31,

The present invention relates to skiving machines, and moi'e particularly to machines for skiving the margins of sheet material, like leather or othei stock used in boot and shoe manufacture. The invention embodies, however, features adapted also for use with other types of machines, as will be made clear in the following description, when taken in connection with the accompanying drawings, and as will be particularly pointed out in the claims annexed to the specification.

ln. skiving` machines of the above-described character, the shoe upper is usually advanced by a feed roll and a feed disk to a rotating skiving` knife which cut-s a scarf in the margin of 'the upper. It is frequently desirable that different margins of thesame shoe upper be provided with scarfs of different angle. In the machine of a copending application, 8erial No. 521,239, tiled December 9, 1921, this i'esult may be attained by adjusting the skiving' knife angularly during the operation of the machine, so that the operator, after skiving a scarf of one angle in a portion of the r margin of the leather, is enabled quickly to change the angular relation of the knife and thefeed roll. Scarfs of different angle may tlius be quickly produced in different portions of the margin of the same shoe upper. It has been proposed to move the feed roll instead, and to hold the knife againsty movement; but such movement of the feed roll disturbs the relative positions of the feed roll and the feed'disk, and this impairs, and sometimes entirely destroys, their cooperative feeding action. i

According to one feature of the piesent invention, the feed roll and the feed disk are movable angularly as a unit duringl the skiving operation, so that the feeding action of the feed'roll and the feed disk is equally effective, no matter what the angle of the scarf.

In present-day, commercial skivinp,- inachines, there is a tendency for the stock to become wrinkled or hunched while it is confined between the feed roll and the feed disk. lf the upper is-wrinkled at the point where itis presented to the knife, the resultinq scarf may be so jagged as to render they upper worthless.

` lines 9 1922. Serial No. 564:,718.

It is accordingly among'the objects of the present invention to overcome this wrinkling tendency. l/Vith this end in view, a feature of the invention resides in stretching the stock while it is confined between the feed roll and the feed disk. i

A further object of the invention to imf prove upon the construction of feed rolls.

Still another object is to provide a skiving machine with an improved presser foot.

lVitli these and other objects in view, the

invention consists of the machine described herein, illustrated in the accompanying; drawings, and defined in the appended claims. It

is intended to set forth in theclaiins all the features of novelty that the invention may line lk-l of Fig: 3, looking' in the direction 'of tbe arrows; Figs. 5 and 6 are sections ytaken uponthe lines 5 5 and 6 6 respectively. of Fig'. 1. looking; in the direction of the arrows; Figs. 7 and 8 are sections taken vupon the lines T-7 and 8 8 respectively, of

Fig. 6, looking,JV in the direction of the arrows; Figs. 9, 104 and 11 are sections taken upon the 9, .1010 and 11,-11`v respectively, .of Fig. 8. looking' in the directions of the arrows; Fig. l2 isan elevation, partlyi'in section, of the feed disk and connecting parts;

Fie'. 13 is a section taken upon the line 13-13 of Fig. (i, lookin in the direction of the arrows; Figs. le and 15 are views of the knife Yand the preferred feed roll of the present invention, shown in different relative positionsacting' upon apiece ofstock; Figs. 16 and 17 are sections taken upon the lines 16-16 `and 17-17 of Fi 9,'. 1, looking` in the directions of the arrows; Fi 18 is a section taken upon the line 1,8%18 of Figi'. 2, looking in the direction of the arrows; Figs. 19, 20 and 21 are sections taken upon the lines `19-19, 20-2O rand 21-21, respectively, of Fig. 1, looking in the direction of the arrows; Fig. 22 is a plan of a. preferred presser foot and gauge, with connecting parts; Fig. 23 is an elevation of the same; Figs. 24 and 25 are sections taken upon the lines 24-24 and 25-25, respectively, of Fig, 22, looking in the directions of the arrows; and Fig. 26 is a section taken upon the line 26-26 of Fig. 23, lookingl in the direction of the arrows.

The invention is for illustrative purposes shown in the accompanying drawings as embodied in a machine having many features in common Vwith the machine of the aboveidentiiied application, and that do not, in

themselves, constitute any part of the present invention. 1t will conduce to clearness to describe some of these` common features in advance of, and as a setting for, the explanation of the features that more particularly relate to the present invention.

The main frame, represented by the numeral 20, is provided with a base portion 21 that may be bolted to a. bench or the like, and with an overhanging arm or head 22 that projects over the base, as will be understood from an inspection of Figs. 1 and 2. rThe overhanging arm 22 carries a skiving knife 185 and a presser or feed disk 143. The base portion 21 houses the feed-roll mechanism and the 'drive elements therefor, the feed roll itself projecting forwardly beyond the base portion. The term feed roll7 will be retained in the present description for convenience, because of the universal use of this term. Strictly, however, the feed roll of the present invention is really two rolls or wheels, and not one, as will be explained later.

A main bearing 25, Fig. 1, extends longitudinally of the head 22 at the upper portion, and to the rear, of the main frame 20. Two projections or lugs 26, Figs. 1, 3 and 5, that are provided each with another main bea ring 27` are fastened to the front end of the head 22 by screws 28. A bearing sleeve 30 extends forward through the bearing 25, and the projecting end of the sleeve 30 supports a bracket 68. A shaft 32 is journaled in the sleeve 30 and the bearings 27. This shaft-will herein be referred to as the feed shaft, because the feed roll and the feed disk are driven therefrom. The feed shaft 32 is adapted to be driven from the knife shaft, as will be explained, hereinafter, through a clutch 44,745 that is located between the feed elements and the knife.

A worm 62 is secured to the feed shaft at the said projecting end of the sleeve 30. A bracket 68 is provided with bearings 7 2 and 73 within which is journaled a shaft 78 that is transversely disposed to the feed shaft 32. Secured to the upper end of the shaft 78 is a worm gear 79 that meshes with the worm 62` and is rotated thereby. Secured to the lower end of the shaft 78, beneath the bearing 73, is a spiral gear 8O that meshes with a transversely disposed spiral gear 81. The gear 81 is secured to a. feed-roll shaft 83 that is journaled in an oscillative bearing 84 and in bearings 85 and 85, through a subframe 566. The bearing 84 tapers or is rounded slightly from the middle 87 thereof towards each end, or in an axial direction, so 'that the same can be rocked within the bore 88 through the inward projecting hub 89. A stud. 9() extends int-o an opening (not shown) of the bearing 84 to facilitate this rocking action, and to prevent axial and `rotative movements of the bearing. The bearing 85 is provided with guiding faces 97 to render it vertically slidable between flanges 98 on each side of an opening 99 -in the frame through which the bearing,- 85 extends. The shaft 83 may therefore be rocked upward or downward for adjustment; or other purposes, by an adjusting screw 191, a spring 107, that acts against the sub-frame 566, maintaining the feed roll comparatively fixed under ordinary working conditions, so as to preserve the width of the scarf uniform.

A worm 135, Figs. 1, 3 and 5, that is secured to the extreme left-hand end of the feed shaft 32, meshes with a worm gear 136 that is keyed or bolted to the upper end of the feed-disk shaft 137. The shaft 137 is journaled at 138 and 139, Fig. 7, in an adjustable bearing 140. The feed-disk shaft 137 is rigidly clamped against longitudinal move- Vment by nuts shown at the top of the shaft,

more particularly in Fig. 7, the customary axial-yielding-permitting spring being omitted. The nuts permit adjusting the feed-disk shaft longitudinally to adjust the position of the feed disk.

The feed disk 143 is mounted at the lower end of the feed-disk shaft 137through the medium of a threaded screw 144 that is threaded into a correspondingly threaded bore provided in the lowerend of the shaft 137. The feed disk is adapted to tilt or pivot transversely to the feed-disk shaft, about the head 18 of the screw 144, in the direction of the arrow, Fig. 12, towards the knife 185 and away from the feed roll 95. This results in very sensitive response to abnormal con-- ditions. In order that this tilting or pivotal movement may be as frictionless possible, the head 18 of the screw 144 is ball-shaped, and the walls of the chan'iber 19 within which it is confined are shaped to corrcspfmd. For convenience of assembly, these walls are formed at 23 on the feed disk and on sepa rable plates 24 that are secured to the feed disk, with the ball head 18 between them, by a screw or screws 29. Fig. 13. Lugs 31 projecting from the ball head 18 engage the walls of suitable recesses in the plates 24 to cause the feed disk to rotate with the shaft 137 upon which it is mounted.

A plunger 33 is forced by a spring 37 into to the right of the bearing 27 in. Fig.y 1.

engagement with the feed disk to oppose yieldingly vthe tilting movement of the feed disk and to maintain the feed disk at right angles to its shaft. rl`he force of the spring 37 may be adjusted by :i collar ll1 that is threadedly adjustable upon thi'eads 57 that are integrally provided upon the bearing 140. The plungerl 88 is mounted in a split collar 142 that is clamped to the lower poi` tion of the bearing 14:0, below the threads 57. A key 245 provided upon the said lower' portion of the bearing 140 is seated in a corresponding groove of the collar 14:2 to prevent accidental rotative movement of the collar 14:2, thus determining` the point on the feed roll 95 at which the feed disk 118 shall tilt. The collar 111-2 is slant'ingly out away, as shown in F ig. 12, to permit the feed disk to tilt.

The knife is directly driven by a beit 1, Fig. 2, and the feed shaft 82, that drives the feed roll and the feeddisk, is driven from the knife. A flanged collar 188, Fig. 8, is fastened in any well known manner to the lower endof the knife shaft 181. The knife 185, shown circular or of disk shape, is cured to the flange of the collar by means oi. a clamp sei'ew or the like 186,'and relative rotative movement of the knife and the coi lar is prevented Iby a dowel pin 11145. The upper end of the knife shaft is provided with a worin 182. This worin meshes with the worm portion of an elongated pinion 168 that is freely rotatable upon a stationary rod 1611. The worm portion of the pinion 163, with which the woiin 182 meshes, is at the rear of this pinion, as will be understood from an inspection of Fig. 10. The front portion of the pinion 168 constitutes a spiral gear that meshes with a spi al gear 162, shown gear is mounted upon a hollow shaft y2, Fig 5,'through which the feed shaft 82 eX tends. The hollow shaft 2 is' freely rotaable with respect to the feed shaft 82. butA f 162, as will be clear from the drawings, are

suoli ythat the gear 182 may operate at coinparatively high speed while the gear 162 is operating at comparatively low speed. `By running the knife shaft 181 'originally at high speed through the belt 1, the worm 182 is directly driven at high speed, andi-stepping down from this high speed to the low speed lof the gear 162 is attended with a minimum of noise and Without overheating the parts.

1t is thus possible to run the machine at as higli a speed as is consistent with the strength of the materialsemployed in building the machine.

Th e

The knife shaft 181 is mounted in a` bearing 180, Fig. 8, that is keyed or otherwise firmly mounted in a knife bracket 170 at 3, Fig. 9. r1`he pulley fl that is driven bythe belt 1 is loosely mounted about the bearing 180. Thev pulley l is connected or locked directly to the knife 185, so that the knifevshaft is driven by the knife. To this end, the sleeve 5, that is integral with the pulley, is oppositely recessed at 6, l* igs. 8 and 11, to receive oppositely disposed, upstanding lugs 7 that are provided upon the flanged knife collar 183. Rotative"4 movement of the pulley is thus necessarily `communieated to the knife; and from the knife., thus indirectly, to the knife shaft 181. rl`he knife shaft is thus enabled to rotate freely aiid ysmoothly in its bearing 180 'without 1attling or vibration, and without wearing any part of the bearing unevenly.' Therecesses 6 are for convenience, in practice, made a little wider than the lugs 7, this introduc ing no undesirable effects from back lash, be cause the knife is always rotated in the same.

direction. j Y

The knife is further prevented from rattling or vibrating during its rotative move ment byv the fact that the knife shaft `181 is maintained snugly fitted inL its bearing 180 during the rotation of the shaft. As the gear For purposes of .ready assembly, the bearing 180 is provided with an annular shoulder 1() upon. which rests the pulley fl, the .pulley that overhangs the lower, portion of the bear.

ing 18() and the upper portion of the flange 183.

The yknife-carrying bracket 170 is angularly adjustable about the rod 164e, being provided with oppositely disposed` bearings 169 and 171, Fig. 8, within which` the rod 16st isl journaled. 170 is also `adjustable transversely of the feed roll 95.. A linger or lug 188, Fig. 1, that projects from the knife bracket 170is yield- The knifecarrying v bracket ingly engaged by a dog 17 through the action of a spring 189 seat-ed in the frame. The spring thus tends to maintain the lug 188 in 4engageinentwith a stop 190. The. position of the stop 19() may beadjustedrby an adjusting screw 191 that is tapped in the head 22 of the Amachine and that engages a shoulder 192 of the stop 190. Adjustment of thescrew 191 vvill therefore result in rotatably adjusting,V

about the rod'16li, the angular position of the knife bracket 1707and,` the knife 185 that is mounted thereon, the springj189 acting al-r ways to maintain the lug 188 in engagement with the adjustable stop 190. The pinions 163 and 182 are maintained in meshing engagement irrespective of the angularly adjusted position of the bracket 170 and the skiving knife 185. This adjustment, which is fully explained in the above-entitled application, is shown retained in the present machine for convenience, though it may be omitted by rea-son of the adjustment that is provided herein of the feed roll 95 and the feed disk 143.

The mechanism for clutching the feed shaft 32 to the hollow shaft 2 will now be eX- plained. An end of the hollow shaft 2 is provided with the clutch element 44, shown as a friction disk, Figs. 1 and 17, that is adapted to cooperate with the friction clutch element 45. The latter is non-rotatably mounted upon the shaft 32. Sliding movement of the clutch element 45 towards and away from the clutch element 44 is permitted by an elongated opening 15, Fig. 17, that is longitudinally provided in the shaft 32, and through which eX- tend-s a bolt or pin 16 that is rigidly secured to the clutch element 45. The clutch elements 44 and 45 are normally maintained separated by a spring 40. The clutch element 45 may be forced into frictional clutching engagement with the clutch element 44, in opposition to the action of the spring 40, by a friction-plug rod 46 that is slidably mounted within a hollow end portion 38 of the shaft 32. To this end, the rod 46 is adapted to be engaged by a friction plug 47 at the end of an arm 48 of a bell-crank lever 49. The lever 49 is intermediately pivoted at 50 between ears 51 of the frame 20. Pivotal movement of the lever 49 will thus result in the rod 46 being moved inward, in opposition to the force of the spring 40, causing the clutch elements to engage frictionally, as above described. The feed shaft 32 may thus be driven from the knife shaft 181. To effect the actuation of the bell-crank lever 49, its end 52 is pivotally connected at 53 to an actuating rod 54 that extends downward through the frame 20 to a foot-operated treadle (not shown).

Upon the release of` the treadle (not shown), the bell-crank lever 49 is returned to its normal position by a spring 14, as will be' understood from Figs. 1 and 20. The spring 40 will thereupon separate the clutch elements 44 and 45. At the same time, the friction face 56 of a brake member 55 will engage a hand wheel 34 that is secured to the hollow portion 38 of the feed shaft 32 to stop the further rotative movement of the feed shaft. The brake 55 is pivotally mounted at 50, and its braking action may be adjusted by a screw 59 that is threadedly mounted upon the bell-crank lever 49.

A pulley 251, Fig. 2, serves as a source of driving power for a grinder disk 194. The grinder disk is fixed to a flanged collar 195 of a grinder shaft 196 by a set screw or the like 197. The flanged collar 195isXed to the shaft 196 by a pin or the like (not shown). Adjacent to the collar, the shaft is provided with a frusto-conical bearing portion adapted to seat in a similarly shaped bearing 199. The bearing 199 is adj ustably clamped in a split socket 203 by bolts 204. The socket 203 is mounted upon a divided rocker arm 218 that is pivoted about a bearing rod 222. The grinder 194 is adjustable vertically, laterally and transversely, and it may be moved into and out of grinding relation to the skiving knife 185, about the bearing'rod 222, by manipulating a handle (not shown) that is secured to the rocker arm 218.

The parts so far described will give a general understanding of the illustrative machine, as a preliminary to the description of the features of novelty that is to follow.

One of the chief objects of the present invention is to provide an improved machine for skiving` different margins of the same piece of stock, such as a shoe upper 502, Figs. 14 and 15, with scarfs of dierent angle. The angle of the scarf may, for example, be wide and slanting, as shown at 504, Fig. 14, or narrow and sharp, as shown at 506, Fig. 15, depending upon the relative angular positions adjustably occupied by the knife 185 and the feed roll 95. According to the present invention, the feed roll 95 is angularly adjustable at the will of the operator to vary the angle of the scarf; and the feed disk 143 is adjustable at the same time, so as to maintain the relative positions of the feed roll and the feed disk unchanged, and their cooperative feeding action, therefore, unimpaired.

The angular adjustment of the feed roll 95 will be discussed first, after which that of the feed disk 143 will be more clearly understood. The feed roll 95 is carried upon the outer end of an arm 512, Figs. 1 and. 13, that is intermediately pivoted upon a terminal ball head 514 provided upon the outer end of the feed-roll shaft 83. Movement of the feed roll in a direction transverse to the,

shaft 83 is prevented by side arms` 518 that enclose between them, and engage the sides of, a forward projecting, vcurved track 520. The pivotal movement of the arm 512 about the ball head 514 in a plane longitudinal of the shaft 83 is thus guided by the curved track 520. The means for effecting this pivotal movement comprises a link 522, necting the arm 512 at 524 and a lever 526 at 528. The lever 526 is pivoted to the frame of the machine at 530. Pivotal movement of the lever 526 about the pivotal point 530 will therefore be communicated, through the link COH- 522, to the arm 512 and the feed roll 95 that i is carried thereby. To effect the pivotal movement of the lever 526, it is intermediately connected, at 532, to one end of a link parallelogram. The arm 520 is not circular, but is designed to permit of the above-described longitudinal and transverse movements of the feed-roll shaft 83.

Provision is made for initially adjusting' the feed roll-along the line of feed; or, stated more specifically', for adjusting the position of the point indicated by the arrow 576 transversely relative to the knife 185, along the line of feed. To this end, the pivotal point 530 of the lever 526 is carried upon the end 580 of a transversely adjustable arm` 582, Fig. 21. The transverse adjustment of the arm 582 is effected by clamp screws 584 that extend through openings 586 in the arm 582 and into a fixed circular-shaped portion 588 of the frame of the machine. The shaft 83 is at the centre of the circle. The arm 582 is correspondingly circularly shaped, so that the adjustment of the pivot-carrying portion 580 of the arm 582 is made along the arc of a circle the centre of which coincides with the centre of the shaft 83. The transverse adjustment of the pivotal point 530 of the lever 526 is thus rendered possible without upsetting the mounting of the lever about the shaft. as described above, and as is illustrated in Fig. 16. The arm 520 is correspondingly adjustable, by means of the slots 585, provided in flanges 587 that are integrally provided upon the arm 520, and bolts 589 that are adapted to be screw-threaded into the frame of the machine, to holdthe arm 520 in pivotally adjustet position on the frame.

The feed disk 143 `is connected to the feed roll 95, so as to tilt therewith, through an arm 702. The arm 702 is pivoted loosely at 704 to anv arm 706 that is rigidly connected to, and forms part of the arm 512. 'l`ilting movement of the feed roll 95 is thus communicated, through the arms 706 and 702, to the feed disk 143. n theory, thel arms 706 and 702 might be rigidly connected to move as a unit. The pivotal connection 704 is preferred, in practice, to prevent binding of the parts and to permit of the abovedescribed adjustment of the arm 582. As is clearly shown in Figs. 3 and 4, the arm 706 is adjustably provided with a pin 708 that passes through a ball 71() mounted in a recess 712 of the arm 702. The ball is clamped in .adjusted position in the recess by a set screw or equivalent device 714.

The arm 702 is integrally connected to the feed-disk-shaft bearing 140. As the feed roll 95 tilts, therefore, the feed disk 143 will tilt in unison with it. The parts are designed to rock about the point indicated b the arrow 576. As the feed-disk shaft tilts, the gear 136 will obviously be moved angularly along the gear 135. The gear 136 is therefore elongated, and it is so designed that, no matter what portion of it contacts with the gear 135, the two gears will always mesh properly. The gear 135 is similarly elongated to provide for some portion of it always meshing with some portion of the gear 136, no matter what the angle of the disk 143 may be.

The frame of the machine is provided with a dovetailed circular recess, forming a track 716, Fig. 6, within which slides a correspondingly shaped tongue 718 that is integral with the feed-disk-shaft bearing 140. The angular movement of the feed disk 143 is thus guided along the circular track 716. To adjust the width of the recess 716, and to correct for possible binding action of the parts, one wall 720 of the recess is provided upon a movable block722. The block 722 may be fixed in adjusted position by set screws 724.

The feed roll and the feed disk may thus be angularly moved as a unit during the operation of the machine, without interfering with the operation of either or of the knife. The angle of feed of the stock may thus be varied to effect scarfs of different angle in themargin of the stock.

The present invention comprises also a novel feed mechanism designed to prevent the stock from wrinkling. According to the illustrated embodiment of the invention, the feed roll 95 comprises two feed rolls or wheels 952L and 95", inclined at an angle to each other, as shown, and adapted to rotate in opposite directions away from each other, in the directions of the respective dotted-line arrows shown in Fig. 6. This rotative movement of the feed wheels 95 and 95" in directions away from each other causes the stock to be stretched as it is fed forward, preventing wrinkling or bunching. The feed wheel 95a is driven directly by mechanism presently to be described. The feed wheel 95h is driven from the feed wheel 95', being geared thereto, as shown more particularly in Fig. 6.

The driving mechanismfor the feed wheel 95a comprises a gear 602, Figs. 1 and 13, the teeth of which mesh with teeth 604 that are 'provided upon the under side of the `feed wheel 95, The gearwheel 602'is driven by the shaft 83. To this end, the gear 602 is centrally perforated to receive the ball head 514 of the shaft 83, and the ball head 514 is slotted at 606 to receive a lug 608 of the gear 602. Rotative movement of the shaft 83 is thus communicated, through the walls of the recess 606 and the lug 608, to the gear wheel 602. The feed wheels 95L and '95" are rotatively mounted in any suitable wav, about pivotal points 610, upon the arm 512. The slot 606 is elongated, as shown in F ig. 13, so that pivotal movement of the arm 512 about the ball head 514 will not be interfered with, and will not affect the rotative movement of, the feed wheels 95EL and 95".

The novel presser foot of the present invention is shown with more particularity in lll) spring arm 652.

tion of these parts will therefore remain undisturbed during the skiving operation, irrespective of the angle of scarf. The supporting block 680 for the spring arm 652 is secured to the arm 512 by screws 682. The gage i 654 is similarly secured by a screw 684.

rlhe j )resser foot 650 is provided with a cylindrical. stem 656 by means of Awhich it is iutermediately freely journaled in a bore 658 that is provided at the free end'of the The free end of a spring 660, that is fastened to the spring arm. by a screw 662, engages a flat shoulder 664 of the presser. foot 650 to maintain the presser footyieldingly against rotative movement about the axis of thebore 658. The spring 660, it will be noted, acts at points, such as the points 666 and 668, that are situated upon opposite sides of the bore 658, so as to oppose yieldingly tilting movement of the presser footin the bore in either direction from the illustrated, normal position. lf the presser foot should be forced by the stock to tilt in the direction indicated by the arrow 670, Fig. 23, it will be returned to the normal position by the action of the spring 660 at the pointy 666. rlhe sp rin g 666 will similarly return the presser footy to its normal position, through its action at the point 668, ifthe displacement of the presser foot is in the ldirection of the arrow 672. The presser foot is thus yieldinglycarried at the free end of the spring arm 652,v and its oscillations in the bore 658, in either direction, are yieldingly opposed by the spring 660. f .r

. Both :the spring arnr'652 and the spring 660 are adjustable, the former by means of two r-:crew-tlufeaded members 674 and 676, and the latter by means of the screw 662. The gage is also adjustable bymeans of the screw 684. rlhe. adjustment of the spring arm 652 will require a littledetailed explanation. The rear -or inner end 685 of the spring arm 652 is mounted in recesses 686of the screw-threaded inenlbers 674 and 676, and is maintained between the walls of these recesses and a wall 688, 26, of the support 680.. Thumb nuts 690 and 692 are threaded upon the screwthreaded portions of the screw-threaded members 674 and 676, respectively, to provide for 'vertical adjustment of the screwfthleaded inemliers. By lowering the screw-tlneaded member 674, for example, and raising the screw-tln'eaded member'676, the presser foot G-maybe lowered relatively to theifeed roll 95. Reverse adjustment will raise the presser foot.- These adjustments will be guided about a screw 694 that is threaded into the support 680 and'that may act further to-clamp the spring` arm 652 to the support 680.

'A pulley 200 that is secured to the shaft 196, above the bearing 199, is driven by a belt 245 that passes from the pulley 251, over -idler pulleys 246. In orderv that the belt 245 may betightened or loosened, as desired, the idler pulleys 246 are made adjustable. 'To

`this end, they are rotatably mounted upon a bracket 2'47 that is pivoted to the frame of the machine at 248, Figs. 2 and 18. In order that the bracket 247 may be held in pivotally adjusted position, it is provided with ay ratchet 250 the teeth of which are adapted to engage 'a spring-pressed pawl 314. The bracket 247 vis provided with a handle, whereby it may be manually pivoted about thefpivotal point 248, the pawl 314 engaging theteeth of the `ratchet to maintain the bracket in vadjusted position. lt is possible to actuate the bracket 247 in the opposite direction by first pressing with the fingers upon the pawl 314, in opposition to the action of its spring.

The description of many portions `of the machine, an understanding of which is not essentialto an understanding of the present invention, has purposely been omitted, and many :parts of the machine have purposely not been illustrated, in order not to distract attention from the features of essential novelty. Fuller explanation of such 'portions of the machine will be found in the copending lapplication above referred-to. It will be understood that the features of novelty' may be embodied in other machines, and in machines of other types, `and that modifications may be made by persons skilled in the art without departing from the spirit and scope of the invention, defined in the appended claims.

What is claimed as new is:

1. A machine of the yclass described having, in combination, operating.mechanism, driving means, two means adapted to cooperate to feed material to the operating mechanism each having driven means Cooperating with the driving means so as to be driven by the driving means, and means operable during the operation of the machine for angularly moving the two feed means asa unit during kthe operationA of the operating mechanism without disturbing the cooperative relation of the driving means and the driven means to vary the angle of feed of the material to the operating mechanism. 2.v A skiving machine having, in combination, a skiving knife, a driving gear, a feed roll and a feed disk for feeding materialto the knife, a. shaft upon which one of the feed members is mounted having a gearineshing with the drivinggearso as to be driven by the driving gear, means freely operable at all times during the operation of the machine for angularly moving the shaft during the operation of the machine to cause the driven gear to travel angularly and bodily over the driving gear, and means whereby the gears are maintained in mesh during the movement of the shaft.

3. A skiving machine having, in combination, a knife for skiving the margin of sheet material, driving means, a feed roll and a feed disk for feeding material to the knife each having driven means cooperating with the driving means so as to be driven by the driving means, and means operable during the operation of the machine for angularly moving the feed roll and the feed disk as a unit during the operation of the machine, wit-hout disturbing the cooperative relation of the driving means and the driven means, to effect the skiving of scarfs of different angle in the margin of the material.

4. A skiving machine having, in combination, a knife for skiving the margin of sheet material, driving means, a feed roll and a feed disk for feeding material to the knife each having driven means cooperating with the driving means so as to be driven by the driving means, a presser foot for yieldingly maintaining the material against the feed roll, and means operable during the operation of the machine for angularly moving the feed roll, the feed disk and the presser foot as a unit during the operation of the machine, without disturbing the cooperative relation of the driving means and the driven means to effect the skiving of scarfs of different angle in the margin of the material.

5. A skiving machine having, in combination, a knife for skiving the margin of sheet material, means for feeding material to the knife, a shaft for driving the feed means having a gear, a. driving shaft for the feedmeans shaft having a gear meshing with the feed-means-shaft gear, and means freely operable at all times during the operation of the machine for angularly and bodily moving the feed-means shaft during the operation of the machine, the gears being adapted to be maintained in mesh during the angular movement of the feed-means shaft, whereby scarfs of different angle may be skived in the margin of the material.

6. A skiving machine having, in combination, a knife for skiving the margin of sheet material, a feed roll and a feed disk for feeding material to the knife, a track for guiding the angular movement of the feed roll, a t ack for guiding the angular movement of the feed disk, and means operable during the operation of the machine for angularly moving the feed roll and the feed disk as a unit along the tracks during the operation of the machine without interfering with the operation of the feed roll or the feed disk, to

effect the skiving of scarfs of different angle in the margin of the material.

7 A skiving machine having, in combination, a knife for skiving the margin of. sheet material, driving means, a feed roll and .a feed disk for feeding material to the knife each having driven means cooperating with the driving means so as to be driven by the driving means, means operable during the operation of the machine for angularly moving the feed roll and the feed disk as a unit during the operation of the machine, without disturbing the cooperative relation of the driving means and the driven means, to effect the skiving of scarfs of different angle in the margin of the material, and means for adjusting the feed roll along the line of feed of the material.

8. A skiving machine having, in combination, a knife for skiving the margin of sheet material, a feed roll and a feed disk for feeding material to the knife, means loosely connecting the feed roll to the feed disk, and means operable during the operation of the machine foi moving the feed roll and the feed disk as a unit during the operation of the machine, without interfering with the operation of the feed roll or the feed disk, to el'lect the skiving of scarfs of different angle in the margin of the material. i

9. A skiving machine having, in combination, a knife for skiving the margin of sheet material, a feed roll for feeding material to the knife, means for moving the feed roll along the circumference of a circle to effect the skiving of scarfs of different angle in the margin of the material, and means for moving the feed roll about a point in the plane of the circle at anangle to the plane.

10. A skiving machine having, in combination, a knife and two feed rolls oppositely rotatable and additional feed means cooperating with the feed rolls for feeding -material to the knife.

ll. A skiving machine having, in combination, a knife, two feed rolls oppositely rotatable and additional feed means cooperating with the feed rolls for feeding material to the knife, means for rotating one of the feed rolls, and means wherebythe other feed roll is rotated from the one feed roll.

12. A skiving machine having, in combination, a knife, two feed rolls oppositely rotatable and a feed disk cooperating with the feed rolls for feeding material to the knife, means forrotating one of the feed rolls, and means whereby the other feed roll is rotated from the one feed roll.

13. A skiving machine having, in combination, a knife, an arm carrying a feed roll for feeding material to the knife, a shaft for actuating' the feed roll, a lever pivoted to the shaft, a link connecting the lever to the arm, and means for actuating the lever to movethe feed roll along an arc through the medium of the link, the arm, the link, the lever, and the shaft constituting a parallelogram.

11i. A skiving machine having, in combination, a knife, a feed roll for feeding material to the knife, a lever, a link connecting the lever to the feed roll, means for actiiiating the lever to move the feed roll angularly through the medium of the link, and means for adjusting the feed roll at an angle to the path of the said angular' movement.

15. A machine of the class described having, in con'ibination, operating mechanism, means comprising tivo members cooperating to feed material to the operating mechanism, the feeding mea-ns being adapted to occupy a normal position in which the feeding means is effective to feed the material, means for moving the feeding means from the nor-mal position to a second effective position, and means tending to return the feeding means towards the normal position, the moving means acting in opposition to the tending means.

16. A skiving machine having, in combination, a knife, means comprising two members cooperating to feed material to the knife, the feeding means being radapted to occupy a normal position in which the feeding means is effective to feed the material, means for moving the feeding means from the normal position to a second effective position, and means tending to return the feeding means towards the normal position, the moving means acting in opposition to the tending means.

17. A skiving machine having, in combination, a knife for skiving the margin of sheet material, a feed roll and a feed disk for feeding the material to the knife, a shaft having a ball head upon Vwhich the feed roll is pivoted, means for angularly moving the feed roll aboutJ the ball head, and means whereby the feed disk moves angularly with the feed roll as a unit.

18. A machine of the class described having, in combination, operating mechanism, a feed roll for feeding material to the operating mechanism, means for moving the feed roll along the circumference of a circle, and means for moving the feed roll about a point in the plane of the circle at an angle to the plane.

19. A skiving machine having, in combination, a knife for skiving the margin of sheet material, a. feed roll for feeding the material to the knife, a lever, a link connecting the lever to the feed roll, a bell-crank lever, a link connecting the lever to the bell-crank lever, means for actuating the bell-crank lever to effect the actuation of the feed roll, and means for returning the feed roll to a normal position. 1

20. A skiving machine having, in combinaion, a knife for skiving the margin of sheet material, a feed roll for feeding the material to the knife, means for angularly moving the feed roll about a centre, and means for moving the centre during the angular movement of the feed roll to maintain the feed roll suitably positioned relative to the knife.

21. A skiving machine having, in combination, a knife for skiving the margin of sheet material, a feed roll for feeding t-he material to the knife, a shaft for rotating the feed roll, a sub-frame in Which the shaft is journaled, a lever pivotally connected to the sub-frame, a link connecting the lever to the feed roll, and means for actuating the lever to move the feed roll angularly and for actuating the subframe to maintain the feed roll suitably positioned relative to the knife.

22. A skiving machine having, in combination, a knife for skiving the margin of sheet material, driving means, a feed roll and a feed disk for feeding material to the knife, each having driven means cooperating with the driving means so as to be driven by the driving means, means for angularly moving t-he feed roll, without disturbing the cooperative relation of the driving means and the driven means, means connecting the feed disk to the feed roll whereby the feed disk moves angularly With the feed roll as a unit, Without disturbing the cooperative relation of the driving means and the driven means, and means for adjusting the feed roll at an angle to the direction of the said angular movement.

28. A skiving machine having, in combination, a knife for skiving the margin of sheet material, two feed rolls and a feed disk cooperating Withthe feed rolls for feeding the material to the knife, and a shaft for rotating one of the feed rolls, the other feed roll being geared to the first feed roll.

24e. A skiving machine having, in combination, a knife for skiving the margin of sheet material, twofeed rolls and a feed disk cooperating With the feed rolls for feeding the material to the knife, a sha-ft, and a gear driven from the shaft, one of the feed rolls having gear teeth meshing with the teeth of said first gear, and the other feed roll being driven from the said rst one feed roll.

25. A skiving machine having, in combination, a knife for skiving the margin of sheet material, two feed rolls and a feed disk cooperating With the feed rolls for feeding the material to the knife, an arm upon Which the feed rolls are carried, means for angularly moving the arm, a perforated gear carried by the arm, one of the feed rolls having gear teeth meshing with the teeth of the gear, the other feed roll `being driven from the one feed roll, and a shaft having a ballhead received Within the perforation in the gear and drivingly connected to the gear.

26. A skiving machine having, in combination, a rotary disk knife for skiving the margin of sheet material, and two meansl acting upon opposite sides of the material to feed llO the material to the knife and to stretch the material While it is confined between the tivo feed means.

Q7. A skiving machine having, in combination, a knife for skiving material, two feed members for engaging the material on opposite sides and feeding it to the knife, the feed members being angularly adjustable as a unit, and means vieldingly tendin to maintain one of the feed members in a normal position.

QS. A machineof the class described having, in con'ibination, a knife, means for operatine' the knife, a pair of feed members for engaging the work one on each side the of and addvancing it to the knife, means for positi velir driving` each of the members, said inembers being singularly adjustable during the operat-ion'of the machine, and connections bet-Ween the members such that thewT are adjusted in unison during the operation of the machine While each of the members is positively driven.

29. machine of the class described `having, in combination, a knife, means for operating the knife, a pair of feed members for engaging the Work one on each side thereof and advancing it to the knife, means for positively driving each of the members, said members being angularly adjustable during the operation of the machine While each of the members is positively driven, and connections between the members such that their relative posit-ion vvith respect to each other remains unchanged.

30. A machine of the class described having, in combination, a knife, means for operating the knife, a pair of feed members for engaging the Work one on each side thereof and advancing it to the knife, and means for positively driving cach of the members, said members being angularly adjustable during the operation of the machine in a path the plane of which is at right angles to the direction ef feed movement of the Work while each of the members is positivel)v driven.

3l. A machine of the class described having, in combination, a knife, means for operating the knife, a. presser and a feed roll located one above the other and arrangedV to engage respectiveljT the upper and the lower side of the Work, means for positivelf,v driv- 'ng the presser and the feed roll, and a carrier upon which the presser and feed roll are mounted, said carrier being angularlyv adjustable during the operation of the machine about :in-axis Which is substantially parallel to the direction of feed movement of the ivork While the presser and the feed roll ure positivelv driven,

A machine of the class described having, in combination, a knife, means for operating the knife, a presser and a feed roll iocated one above the other and arranged to engage respectively the upper and the lower side of the Work, means for positively driving mener-e the presser and the feed roll, and a carrier upon which the presser and feed roll are mounted, said carrier being angularly adjustable aoout an axis which is substantiall)y oarallel to the direction of feed movement of the ivork and passes substantially through a point at one end of the roll and close to the edge of the knife while the presser and the feed roll are positively driven.

A. machine of the class described having, in conibination, a knife, a presser, a feed roll, a. bracket upon which both the presser and feed roll are mounted, a sp 'ing acting to urge the roll toward a normal position, and means whereby the bracket may be adj ust-cd angularly.

S-l-l. t machine of the class described having, in combination, a knife., a presser, a feed roll, a bracket upon which both the presser and feed roll are mounted, a spring acting to urge the roll toivard a normal. position, and means ivherelryY the bracket may be adjusted angularljfY about an ais which is approximatelY parallel to the direction of feed of the Work and passes Substantially through a point at one end of the roll which, at any given moment, is in position to engage the work.

35. A skiving machine having, in combination, a knife for skiving the margin of sheet material, means comprising a feed roll and a feed disk for feeding material to the knife, means for moving the feed roll and the feed disk from a normal position, and means tending to return the feed roll and the feed disk towards the normal position, the moving means acting in opposition to the tending means.

A. machine of the class described having, in combination, a knife, means for engaging and advancing to the knife a piece of Work, said means including a pair of feed members arranged to engage the ivork one on each side thereof, a carrier for said meinbers, means connected .vith each of said members for driving it, and means operable during the operation of the machine whereby the carrier may be adjusted angularly during the operation of the machine in a path the plane of Which is at an angle to the direction of feed movement of the ivork vvhile maintaining the driving connections operative.

37. A skiving machine having, in combination, a knife for skiving the margin of sheet material, a feed roll and a feed disk for feeding the material to the knife, means for moving the feed roll and the feed disk as a unit from a normal position, and means tending to return the feed roll and the feed disk towards the normal position, the moving means acting in opposition to the tending means.

38. A skiving machine having, in combination, a skiving knife` a driving gear, a feed roll and a feed disk for feeding material to the knife, a shaft upon which the feed lit) disk is mounted having a gear meshing With the driving gear so as to be driven by the driving gear, means operable during the operation of the machine for moving the feed-disk shaft during the operation of the machine, and means for maintaining the gears in mesh during the movement gf the shaft.

39. A skiving machine having, in combination, a skiving knife, a feed roll and a feed disk for feeding material to the knife, driving means comprising a driving` gear, a shaft upon which one of the feed members is mounted having a gear meshing with drivinggear so as to be driven by the driving gear, means connecting the other feed member with the driving means so as to be driven by the driving means, andl means operable during the operation of the machine for angularly moving the feed roll, the feed disk and the shaft as a unit during the operation of the machine Without disturbing thev cooperative relation of the means connecting the said other feed member With the driving means and While maintaining the gears in mesh.

40. A skiving machine having, in combination, a knife for skiving the margin of sheet material a feed roll and a feed disk for feeding material to the knife, the feed disk having a shaft provided With a gear, a driving shaft having a gear meshing with the firstnained gear, and means for pivotally adj usting one of the shafts ivithoutcausing unmeshing of the teeth of the gears.

4l. A skiving machine having, in combination, a rotary disk knife for skiving lthe margin of sheet material, means for rotating the knife, and means for feeding the material to the knife and for preventing the material from ivrinkling While it is fed, the effective portions of the feed means being situated just to one side of the knife in the direction ofy feed.

42. A skiving machine having, in combination, a knife for skiving the margin of sheet material, and means comprising a feed roll and a feed disk for feeding material to the knife and for stretching the material While it is confined by the feed roll and the feed disk, the effective portions of the feed roll and the feed disk being situated just to one side of the knife in the direction of feed.

43. A skiving machine having, in combination, a knife for skiving material, means for operating the knife, tivo feed members for engaging the material on opposite sides and feeding it to the knife, means for positively driving each of the feed members, and means for angularly adjusting the feed members as a unit While the feed members are both positively driven.

44. A skiving machine having, in combination, a knife for skiving the margin of sheet material, two feed members adapted to eooperate to feed the material to the knife, an angularly adjustable carrier upon which the feed members are mounted, means freely operable at all times during the operation of the machine for angularly adjusting the carrier during the operation of the machine, a track for confining the carrier to move angularly, and means for adj ustably limiting the angular adjustment of the carrier.

45. A skiving machine having, in combination, a knife for skiving the margin of sheet material, tivo feed members adapted to cooperate to feed the material to the knife, a carrier upon which the feed men'ibers are mounted, means for positively driving each of the feed members, means operable during the operation of the machine for adjusting the carrier during the operation of the machine While each of the members is positively driven, and a track for confining the carrier to move angularly.

46. A skiving machine having, in combination, a knife for skiving the margin of sheet material, two feed members adapted to cooperate to feed the material to the knife, a carrier upon Which the feed members are mounted, means freely operable during the operation of the machine for angularly adjusting the carrier during the operation of the machine, and a track for confining the carrier to move angularly.

47. A skiving machine having, in combination, a knife, a feed roll, a support for a presser foot provided with a bore the axis of Which extends substantially in the direction of the feed, and a presser foot having an intermediately disposed cylindrical stem journaled in the bore, whereby the presser foot is intermediately pivoted about the stem as a pivot.

48. Av skiving machine having, in combination, a knife, a feed roll,l a support for a presser foot provided with a bore the axis of which extends substantially in the direction of feed, a presser foot having an intermediately disposed cylindrical stem freely journaled in the bore, whereby the presser foot is intermediately pivoted freely about the stem as a pivot, and means yieldingly acting upon the presser foot upon both sides of the stem tending to maintain the presser foot yieldingly in a predetermined pivotal position.

49. A skiving machine having, in combination, a knife, a feed roll, a support, a leaf spring fastened to the support in such a manner that its outer end is yieldingly movable toward and from the roll, the outer end of the spring being provided With a bore, a presser foot having an intermediately disposed cylindrical stem freely journaledl in the bore, whereby the presser foot is intermediately pivoted freely about the stem as a pivot, and a single spring acting upon the presser foot upon both sides of the stem tending to maintain the presser foot yieldingly in a predetermined pivotal position.

50. A skiving machine having, in combina- Cil lOO

tion, a knife for skiving the margin of sheet material, a feed roll and afeed disk for feeding the material to the knife, means for angularly moving the feed roll and the feed disk as a unit from a normal position, and means tending to ret-urn the feed roll and the feed disk as a unit towards the normal position, the moving means acting in opposition to the tending means.

5l. A skiving machine having, in combination, a knife for skiving the margin of sheet material, a feed roll and a feed disk for feeding the material to the knife, the feed roll and the feed disk being adapted to occupy a normal position during the operation of the machine and being angularly adjustable as a unit during the operation of the machine to feed the material to the knife at varying angles and thereby to vary the scarf out in the margin of the material, means operable during` the operation of the machine for angularly adjusting the feed roll and the feed disk as a unit, and means tending to return the feed roll and the feed disk as a unit towards the normal position, the moving means acting in opposition to the tending means.

52. A skiving machine having, in combination, a knife for skiving the margin of sheet material, two feed members adapted to cooperate to feed the material to the knife, an angularly adjustable carrier upon which the feed members are mounted, the carrier being adapted to occupy a normal position during the opera-tion of the machine in which the feed members are effective to feed the material, means -operable during the operation of the machine for angularly moving the carrier from the normal position to a second effective position to effect the skiving of scarfs of different angle in the margin of the material, and a track for confining the carrier to move angularly, the moving means acting in opposition to the tending means.

In testimony Where-of, I have hereunto subscribed my name this 26th day of May, 1922.

ANDREV R. RIDDERSTROM. 

